ASTM A312 TP304LN Austenitic Stainless Steel Pipes
ASTM A312 TP304LN (UNS S30453) is a nitrogen-enhanced austenitic stainless steel pipe designed to offer higher strength, improved corrosion resistance, and better toughness compared to standard 304/304L grades. The added nitrogen (N) increases yield strength while maintaining excellent weldability and low-carbon characteristics, making TP304LN ideal for applications that demand durability in corrosive, low-temperature, and high-pressure environments.
These pipes are widely used in chemical processing, cryogenic systems, food-grade transport lines, and architectural structures requiring enhanced mechanical performance.
Key Features
- Nitrogen enhanced (N-Alloyed) for higher strength and improved corrosion resistance
- Low carbon grade prevents carbide precipitation during welding
- Superior toughness, even in cryogenic temperatures
- Excellent resistance to intergranular corrosion & pitting
- Great weldability and formability
- High cleanliness & hygienic properties for food & pharma industries
- Long service life with low maintenance
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30453 |
| EN/DIN | 1.4311 |
| JIS | SUS304LN |
| BS | 304S53 |
Available Sizes
-
Outer Diameter: 6 mm – 610 mm
-
Wall Thickness: 1 mm – 60 mm
-
Schedules: SCH 5 – XXS
-
Length: Up to 12 meters
ASTM A312 TP304LN Chemical Composition (TP304LN)
| Element | % |
|---|---|
| C | ≤ 0.030 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Cr | 18.0 – 20.0 |
| Ni | 8.0 – 12.0 |
| N | 0.10 – 0.16 |
| Fe | Balance |
ASTM A312 TP304LN Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 580 MPa |
| Yield Strength | ≥ 260 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 95 HRB |
ASTM A312 TP304LN Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1400–1450°C |
| Thermal Conductivity | 16.2 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Elastic Modulus | 193 GPa |
| Thermal Expansion | 17.0 µm/m°C |
Types of TP304LN Pipes
- Seamless Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Hot Finished & Cold Drawn Pipes
- Polished Pipes (180 / 240 / 320 / 600 Grit)
- Fabricated Pipes
Applications
- Chemical Processing Plants
- Food & Dairy Processing Lines
- Pharmaceutical Equipment
- Cryogenic Pipelines
- Pressure Vessels & Heat Exchangers
- Water Treatment Systems
- Architectural & Structural Applications
- Pulp & Paper Industry
- Marine & Offshore Equipment
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